Based　on　the　spectral　analysis　technology,　agronomic　parameter　estimation　which　can　obtain　information　on　crop　growth　and　nutrition,　is　efficient　technology　guarantee　for　the　development　of　precision　agriculture.　On　the　basis　of　introducing　the　crop　spectral　theory,　from　mechanism　model,　experience　and　mechanism　combination　model,　empirical　model　three　parts,　the　research　progress　on　agronomic　parameter　estimation　by　spectral　analysis　technology　was　discussed　in　detail,　and　the　characteristics　of　various　models　were　pointed　out.　In　future,　model　optimization　on　the　internal　level　and　level　of　smoothness　of　leaves　should　be　strengthened,　and　the　range　of　crops　and　the　amount　of　data　collected　also　should　be　increased,　to　expand　the　applicability　of　the　model　and　improve　the　prediction　accuracy　of　agronomic　parameter.　©　2011　Intl　Journal　of　Adv　Mechatr.