A light source module, a projector using the same and a light source control method are disclosed. The light source module includes a laser light source, a temperature sensor, a light source driver and a controller. The temperature sensor is adjacent to the light source and configured to sense a light source temperature of the laser light source. The controller is configured to: (1) determine whether the light source temperature reaches a first temperature value; (2) if yes, control the light source driver to drive the laser light source to illuminate by a first current; (3) determine whether the light source temperature changes from the first temperature value to a second temperature value different from the first temperature value; and, (4) if yes, control the light source driver to drive the laser light source to illuminate by a second current different from the first current.