Abstract: According to the current status of radiotracer test of the oil field, 5 experimental studies in cluding its control and clearing of contaminate, choice of radioactivity of tracer and flushing water, choice of size of tracer, knowledge on temperature abnormal and determination of adaptable pressure range of tracer are conducted. The problems of contamination and peak abnormal are solved. Proceeding of field test implementation is upgraded. Better results are obtained and it is useful to tracer log and the development of oil field as well as to improve the level of understanding and interpretation of tracer log data.