The invention discloses a PDR course angle determining method fusing an electronic compass and a gyroscope. The method includes the steps of 1, using the electronic compass to obtain a course angle psi; 2, using the gyroscope to obtain a course angle psi; 3, fusing the electronic compass and the gyroscope to determine a course angle psik in a self-adaptation manner; 3.1, using the filtered data of the electronic compass to initialize the course angle, psi1=psi1; 3.2, using a fusing algorithm to determine the course angle psik. The PDR course angle determining method has the advantages that by the method, course angle estimation precision can be increased, and accordingly PDR positioning precision is increased greatly; the method is applicable to portable equipment with built-in inertial sensor, and the inertial sensor refers to a three-axis magnetometer, a three-axis accelerometer and a three-axis gyroscope.