The Kertak Hanyar village denote area agricultural land rich and green. with domination popuration livelihoods a -farmer, but in process growth by sustain convertion land become land to housing, office complex and industry. Research method used a qualitative approach with a variant of phenomenology. Data collection techniques used a'thick descripion while data analysis a used interactive model with four grooves that is data collection, data reduction, data presentation and conclusion continuously until saturated. Conclusion shows farmers become actor agriculturar land convertion. The farmers do action selling agricultural land them to government part and private part. This selling action agricultural land for farmers denote rational choice presently. With action rational choice a farmers mentioned do not loss agricultal land, because farmers are have agricultural land wider although location land further from previous. Consideration factor do farmers rational action as forlows: 1) absence irrigation channels; 2) impact population density city Banjarmasin; 3)slackening soil fertility. Keywords: Rational Choice, Farmer, Agricultural Land Conversion