The urban-rural relationship is an important social connection and spatial connection not only at present but also a fairly long time of future in China, however the urban-rural integration is the basic trend of the urban-rural relationship development. The urban-rural relationship and integration course of Northeast China compared with other regions has universality and individuality as well. The paper selects Dalian, Changchun and Baicheng respectively as investigation objects on coastal large cities, large cities in the middle part of Northeast China and western medium-sized cities, then makes relatively deep positive research and comparison analysis on the urban-rural integration of the typical cities. The research mainly substitutes downtown area of the current administration division for city proper. The peripheral counties and a few distant suburbs are taken as rural regions. The villages and towns are selected as research units in order to describe the space-time difference of urban-rural integration inside the counties. The synthetical index method is adopted so as to evaluate the urban-rural integration course. The synthetical index of urban-rural integration is composed of the development level of economy, the non-agriculture level of village, social fairness and welfare, traffic and daily connection etc., which is between 0 and 100 and is obtained by ratio between each index of village microcosmic region(village and town, county) and each index of central city weighted sum. The conclusion by the synthetical index method and observation is that the urban-rural connection is strengthened gradually and is tending to diversify, the peripheral regions around the central cities has engendered spatial sequences of four classes, including advanced integration region (the first class), medium integration region(the second class), primary integration region(the third class), and the traditional village region(the fourth class). The integration region sequences of four classes in Dalian is complete. In addition the advanced integration region has come into being and is expanding, the urban-rural relationship tends to integrate, Changchun region lacks the first class, Baicheng has the third class and the fourth class only, the urban-rural dual structure is still obvious. The first and second class integration region can be looked upon as functional urban area (the metropolitan area). The urban-rural integration course is positively related to per capita GDP—the representative of the development level of economy. The paper aims to advance the research of this kind of question in science by quantitative investigation on the space-time course of the urban-rural integration of each city proper. The mentioned above three types can represent the whole condition and space difference of the course in northeast region. The conclusion can be taken as a basis while all kinds of specific questions, such as the Northeast regional urbanization, the urban-rural relationship, the delimitation of functional urban region, and the urban-rural development strategy are researched.