Abstract-Development of teaching material is very necessary because it will make valid, practical, and effective teaching material. The purpose of this research was to develop the teaching material in the form of valid field research based handout on palm tree population structure in Rampah The results showed that the validation score of teaching materials in the form of handouts feasibility aspects of the content was 88.23% (highly valid), the presentation of the feasibility aspects was 91.66% (highly valid), feasibility aspects of language was 93.26% (highly valid) and students test legibility was 87.50% (excellent). From the assessment of expert validation and test of legibility students the teaching materials, the handout on palm tree population structure (Arenga pinnata Merr.) in Rampah Manjangan waterfall Loksado was highly valid and very well used as a supplementary material on ecological plants population concepts in Biology Education Department, Universitas Lambung Mangkurat, Banjarmasin.