A method for adjusting a projected image, comprising: acquiring a distance between a mobile terminal and a projection screen; and adjusting at least one of the size of a display area or a display orientation of a projected image on the projection screen at least according to the distance between the mobile terminal and the projection screen; wherein adjusting the size of the display area of the projected image on the projection screen at least according to the distance between the mobile terminal and the projection screen comprises: judging whether the distance between the mobile terminal and the projection screen is between a first threshold and a second threshold; when it is judged that the distance between the mobile terminal and the projection screen is between the first threshold and the second threshold, adjusting the size of the display area of the projected image based on a preset scale rule according to the distance between the mobile terminal and the projection screen; or, acquiring from a preset rule table a first area corresponding to the distance between the mobile terminal and the projection screen; and adjusting the display area of the projected image to the first area; or, multiplying the distance between the mobile terminal and the projection screen by a specified scale to acquire a second area, wherein the specified scale is a scale value of a standard projection area to a standard projection distance of the projection device; and adjusting the display area of the projected image to the second area; wherein acquiring the distance between the mobile terminal and the projection screen comprises: acquiring a specified distance L between a projection device and the projection screen, and a first distance L1 between the projection device and the mobile terminal; calculating the distance L2 between the mobile terminal and the projection screen according to the specified distance L and the first distance L1; wherein the distance L2 between the mobile terminal and the projection screen is calculated by the following formulae: L 2 = L − L 1 2 − L 3 2, when α≤90°; L 2 = L + L 1 2 − L 3 2, when α>90°; where the L is the specified distance, the L1 is the first distance, the α is an included angle between a line segment corresponding to the L and a line segment corresponding to the LI, the L3 is a distance between an intersection point A and an intersection point B, and is equal to sln α; wherein the intersection point A is an orthogonal projection point of the projection device onto a plane of the projection screen, and the intersection point B is an orthogonal projection point of the mobile terminal onto the plane of the projection screen. acquiring a distance between a mobile terminal and a projection screen; and adjusting at least one of the size of a display area or a display orientation of a projected image on the projection screen at least according to the distance between the mobile terminal and the projection screen; wherein adjusting the size of the display area of the projected image on the projection screen at least according to the distance between the mobile terminal and the projection screen comprises: judging whether the distance between the mobile terminal and the projection screen is between a first threshold and a second threshold; when it is judged that the distance between the mobile terminal and the projection screen is between the first threshold and the second threshold, adjusting the size of the display area of the projected image based on a preset scale rule according to the distance between the mobile terminal and the projection screen; or, acquiring from a preset rule table a first area corresponding to the distance between the mobile terminal and the projection screen; and adjusting the display area of the projected image to the first area; or, multiplying the distance between the mobile terminal and the projection screen by a specified scale to acquire a second area, wherein the specified scale is a scale value of a standard projection area to a standard projection distance of the projection device; and adjusting the display area of the projected image to the second area; wherein acquiring the distance between the mobile terminal and the projection screen comprises: acquiring a specified distance L between a projection device and the projection screen, and a first distance L1 between the projection device and the mobile terminal; calculating the distance L2 between the mobile terminal and the projection screen according to the specified distance L and the first distance L1; wherein the distance L2 between the mobile terminal and the projection screen is calculated by the following formulae: L 2 = L − L 1 2 − L 3 2, when α≤90°; L 2 = L + L 1 2 − L 3 2, when α>90°; where the L is the specified distance, the L1 is the first distance, the α is an included angle between a line segment corresponding to the L and a line segment corresponding to the LI, the L3 is a distance between an intersection point A and an intersection point B, and is equal to sln α; wherein the intersection point A is an orthogonal projection point of the projection device onto a plane of the projection screen, and the intersection point B is an orthogonal projection point of the mobile terminal onto the plane of the projection screen.