We have constructed a long life time multi-point contact MIM. The diode mount is adjusted by combining the mechanical and electrical structure. Using W-Ni, W-Fe and W-Cu multi-point contact MIM, the fast response signals at 23 GHz in em wave, 50 GHz in mm wave, 10.6μm in CO2 laser and 6328 A in He-Ne laser have been detected. The beat signal of about 30 MHz have been observed from two grating-tuned CO2 lasers.