Abstract: Potassium nitrate is not only an important industrial raw material, but also is a high-quality chlorine-free potassium-nitrogen compound fertilizer.Its total mass fraction of potassium and nitrogen plant nutrients may reach about 60%.Therefore it is an essential fertilizer variety for the development of modern high-efficiency agriculture.At present,potassium nitrate was few employed in China due to production,market,and price reasons.But this scarce fertilizer which is called<SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">‘</SPAN><SPAN lang=EN-US>green potassium fertilizer</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">’</SPAN><SPAN lang=EN-US>was in vogue in the European countries.Along with the continuous development of high-tech agriculture,as well as the people</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">′</SPAN><SPAN lang=EN-US>s increasing requirements on food security,potassium nitrate</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">′</SPAN><SPAN lang=EN-US>s market demand in China will continue to increase,but the market is still too narrow at present.Production technologies,present production situation in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:country-region w:st="on">China</st1:country-region></st1:place>,application fields and market prospect of potassium nitrate were introduced and some proposals for the development of potassium nitrate were also put forward.</SPAN>