The solar irradiation in Kuwait had been measured at different (347.5, 450, 550, 650, 700, and 800nm). The data collected during period of time starting first May 1995 to the end of July 1997. The periodical analysis of data indicates that there is a relation between daily variation of solar radiation and climate parameters. The effects of cloud cover sky is appear in all measured spectral regions, but is weak in the Ultraviolet region (315-380nm).The period 6.1-days in the ratio of solar radiation is in good agreement with the measured variation of atmospheric pressure in Kuwait. The irradiation near ultraviolet region show weak irradiation intensity. But in Infrared region (700-800nm) show high irradiation Intensity,compared with the other regions were studied here, and with other places have same latitude(phi).