The　parameters　of　a　pump　have　a　marked　influence　on　the　performance　of　distributed　feedback　polymer　lasers.　Our　polymer　laser　consisted　of　a　grating　and　a　polymer　film.　We　fabricated　the　grating　using　interference　lithography.　The　polymer　film　was　spin　coated　on　the　grating.　A　half-wave　plate　was　used　to　change　the　pump　polarization,　and　an　x-y　slit　was　used　to　change　the　pump　size.　The　direction　of　grating　lines　were　parallel　to　the　x　axis　of　the　slit.　The　laser　performance　was　modified　by　changing　the　polarizations　and　sizes　of　the　pump　beam.　The　lasing　threshold　increased　more　rapidly　with　decreasing　pump　size　in　the　y　direction　than　in　the　x　direction.　The　influence　of　the　pump　polarization　on　the　lasing　threshold　for　decreasing　pump　size　in　the　x　direction　was　greater　than　that　for　decreasing　pump　size　in　the　y　direction.　These　results　may　be　useful　for　the　miniaturization　of　distributed　feedback　polymer　lasers.