Real-time measurement of downhole temperature and pressure is helpful to improve the coring process and increase core recovery during wireline core drilling. At the same time， the downhole in-situ measurement data is of great significance to understand the physical characteristics of core， especially in the exploration of gas hydrate in the sea. The structure and working principle of the temperature and pressure collector are introduced in this paper. The collector is powered by dry battery and can work for a measurement run more than 72h. It can collect and store temperature and pressure parameters in the core barrel during the whole sampling process. The data can be obtained when it is connected with the computer. The collector completed a test run onborad the Marine Geology 10 drilling vessel， and obtained temperature and pressure data for the entire wire-line coring process. Analysis shows that the data is consistent with the actual coring process， and the collected data is stable and reliable.