diff --git a/csst_cpic_sim/target.py b/csst_cpic_sim/target.py
index d9f3af458aaa14cb79f18d5ca2853841be6f838f..c9d157a289f343c94cec5161ccf8fa60e47db923 100644
--- a/csst_cpic_sim/target.py
+++ b/csst_cpic_sim/target.py
@@ -22,7 +22,6 @@ DEFAULT_FILTER_FILE = config['default_band']
 HYBRID_MODEL_FILE = config['hybrid_model']
 BCC_MODEL_FOLDER = config['bcc_model']
 MAG_SYSTEM = config['mag_system']
-DEFAULT_FILTER = S.ObsBandpass('johnson,v')
 CATALOG_CACHE = {}
 
 class AlbedoCat(S.spectrum.TabularSpectralElement, S.catalog.Icat):