In order to study optimization and application of testing technology for high-production and high-waxy well offshore， the causes of the problems with the test of the high-production and high-waxy reservoir in the West Lake were analyzed and the technology at home and abroad was investigated in light of the problems with a well test in the West Lake Sag， East China Sea. At the same time， the research on the fluidity support technology for the test string and the surface test process， and the research on the crude oil combustion guarantee technology were carried out. The results showed that the main causes that affect the test were the wax formation in the surface flow， large particles of backflow debris from the large choke and the damage of the combustion head due to burning of large volume of crude oil. The test string， the surface test flow and the combustion support technology were optimized so as to solve the problems related to high-production and high-waxy well tests.