【常住人口】指实际经常居住在某地区一定时间（指半年以上）的人口。按人口普查和人口变动抽样调查规定，主要包括：1.除离开本地半年以上（不包括在国外工作或学习的人）的全部常住本地的户籍人口；2.户口在外地，但在本地居住半年以上者，或离开户口地半年以上而调查时在本地居住的人口；3.调查时居住在本地，但在任何地方都没有登记常住户口，如手持户口迁移证、出生证、退伍证、解除劳改劳教等尚未办理常住户口的人。

【户籍人口】指公民依照《中华人民共和国户口登记条例》，已在其经常居住地的公安户籍管理机关登记了常住户口的人。这类人口不管其是否外出，也不管外出时间长短，只要在某地注册有常住户口，则为该地区的户籍人口。户籍人口数一般是通过公安部门的经常性统计月报或年报取得。

【晚婚率】指在一定时期内(通常为一年)的女性初婚人口中23岁以上人数占当年女性初婚人数的比例，一般用百分比表示。计算公式：

【出生率(又称粗出生率)】指在一定时期内(通常为一年)一定地区的出生人数与同期平均人数(或期中人数)之比, 一般用千分率表示。计算公式：

式中：出生人数是指活产婴儿，即胎儿脱离母体时(不管怀孕月数)，有过呼吸或其他生命现象。年平均人数是年初、年底人口数的平均数，也可用年中人口数代替。

【死亡率(又称粗死亡率)】指在一定时期内(通常为一年)一定地区的死亡人数与同期平均人数(或期中人数)之比, 一般用千分率表示。计算公式：

【人口自然增长率】 指在一定时期内(通常为一年)人口自然增加数(出生人数减死亡人数)与该时期内平均人数(或期中人数)之比,一般用千分率表示。计算公式：

【The population of permanent residents】refers to the population who actually and usually lives in a given area for a certain time (above half a year). According to the provisions of the population census and the sampling survey of population, the population of permanent residents mainly includes the following types: 1.All registered population who usually live in one certain place, excluding the person who leave away above half a year, including persons working or studying abroad. 2.The population who has lived in a certain place above half a year and whose household registration at other place, or living at a certain place at the survey moment, and leaving the household registered location for half a year. 3.The population who live at a certain place at the survey moment, but without registered permanent residence certificate everywhere, for example the person who has not gained registered permanent residence certificate, and with registration movement certificate, birth certificate,retirement certificate,or prisoners released certificate.

【The registered population】According to the household registration ordinance of the People's Republic of China, the registered population refers to the citizens who have registered in the household registration department where the citizens usually live. No matter going out or not, no matter how long dose he go out, as long as the person has gained the permanent residence registration, the person is the region's registered population. Registered population data is generally gained from the regular statistical monthly or annual report of republic security department.

【Late Marriage Rate】refers to the proportion of women who are over 23 years old in the number of first marriage women in a certain period (usually one year), which is generally expressed as a percentage. Calculation formula:

Late Marriage Rate = Number of first marriage of women over 23 years of age / number of first marriage of women in this year × 100%

【Birth Rate (or Crude Birth Rate)】 means the ratio bet-ween the number of births in a certain period (usually a year)and the average population in the same period (or mid-year figure). It is usually calculated in terms of permillage and its calculating formula is:

Number of Births refers to live births,when babies have sho-wed any vital phenomena regardless of the length of pregnancy.

Average Number of Population is the average of the number of population at the beginning of the year and,at the end of the year and sometimes is substituted for with mid-year population.

【Death Rate(or Crude Death Rate)】 refers to the ratio of number of deaths to the average population (or mid-year popula-tion)during a certain period of time (usually a year),which is often presented as perminvar. Its calculating formula is:

【Natural Growth Rate of Population】 refers to the ratio of natural increase in population (number of births minus number of deaths) in a certain period of time (usually a year) to the average population (or mid-year population) of the same period,which is often presented as perminvar. The following formula are applied: