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The growth temperature curve of the growth system for the potass ium li thium niobate (KLN) has been measured and the temperature decrease program has b een calculated. KLN crystals with a size up to 30mm × 15mm × 5 mm have be en grown by flux method. The primary factors of the cracking of KLN crystal hav e been discussed. A blue laser light output has been obtained by optical parame tric oscillator pumping.