Using the electronic data acquisition system, various performance tests of microchannel plate type photomultiplier tubes (MCP-PMT) at different focus levels were performed in the geomagnetic environment, such as single photoelectron spectrum and after pulse, transit time fluctuations, signal rise and fall time, collection efficiency and so on. By changing the relative position of the photomultiplier tube and the geomagnetic field, the performance of the MCP-PMT at different angles was measured, and the geomagnetic field was qualitatively analyzed by comparing the performance of MCP-PMT under the shielding magnetic field and geomagnetic field.