The present invention provides a method for controlling a projector and a projector applicable to the method. The method for controlling a projector comprises steps: enabling a projector, and projecting on a screen; enabling a sensing module, and obtaining an output image or a current environment image; processing the output image or the current environment image to obtain an RGB component, and calculating the gain coefficients of three channels RGB according to an automatic white balance algorithm; and adjusting the gains of the three channels RGB in the projector according to the gain coefficients. Using the method and the projector enables a projection screen not to be limited by colors, that is, screens with various colors can be chosen at ease, and the imaging effect of projection is not influenced. In addition, the projector can further eliminate the influence of color temperature of light of surrounding environment on the projection effects, so as to greatly improve the projection effects.
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