flow chart of the method of manufacturing a ceramic plate with reflective film of the present invention referring to fig2 an illustrative method to manufacture the ceramic plate may include the following steps providing a ceramic substrate 11 at the first step 101 and providing a reflective film material on the ceramic substrate 11 at the step 102 and then in pre baking the step 103 the ceramic substrate 11 with the reflective film material is heated at 150 degree centigrade for 15 minutes in the heating chamber for pasting the reflective film material on the ceramic substrate 11 is smooth after the step 103 at step 104 sintering the ceramic substrate 11 with the reflective film material annealing process step 105 comes after the sintering process step 104 for forming a ceramic plate with reflective film the reflective film material becomes a reflective film 12 after the sintering process and reflective film 12 includes a glass layer 13 formed on a surface of the ceramic substrate 11 and metal film 14 with metal crystals formed on the glass layer 13 the sintering curve diagram of the sintering process step 104 and the annealing step 105 shown in fig3 after the annealing process step 105 measures the metal crystals diameters of the metal film 14 at step 106 if the metal crystals diameters of the metal film 14 is not the predetermined range as 4 u03bcm to 15 u03bcm repeat the sintering process step 104 and the annealing process step 105 till the metal crystals diameters of the metal film 14 reach the predetermined range and accomplish the ceramic plate of the present invention fig3 illustrates a curve diagram between sintering temperature and.