Since 1978, about 5000 accessions of wild soybean（including G.Soja and semiwild types）have been collected in China. They distributed roughly at 24—53°N, 97-134°E and 0-265OM. Some botanical, ecological, cytological, genetical, biochemical and molecular-biological studies were done. Some special types, such as long infloresence white flower, yellow and green seed-coat were found. The growing Period varied from about 80-210 days. Photo-thermo effect（in dark room and growth-chamber） on development was analyzed. According to the data of 343 accessions from China, Japan, South Korea and USSR, seven regions and thirteen subregions of photo-thermo ecotypes were classified. A diploid strain of wild soybean with four-satellited chromosome was discovered. Mean protein content of 1695 accessions was 46.80+3.18%, the highest one 55.37%. Cloning and characterization of coding sequences for storage protein in wild soybean were dane, The frequencies of Ti, Spl and SOD alleles from various locations were detected. Some high-resistant strains to Aphis glycines were discovered. Interspecific inheritance of soybean were studied and some high-protein strains were obtained. Comparative studies of wild and cultivated soybean in China on ecology, seed composition and seed protein electrophoresis all supported that Yellow River Valley （around 35°N）might be the main original area of soybean. Comparative studies on botanical and biochemical characters were also done and some new notions of soybean evolution and taxonomy were explored. Research work in future is proposed.