<Regions:TabControlRegionAdapter.ItemContainerStyle>
                <Style TargetType="controls:TabItem" BasedOn="{StaticResource TabControlItemStyleFlight}">
                    <Setter Property="HeaderTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <TextBlock Text="ABC" />
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                    <Setter Property="Height" Value="24"/>
                    <Setter Property="Margin" Value="9,0,-9,0"/>
                </Style>
            </Regions:TabControlRegionAdapter.ItemContainerStyle>

问题关键就在BasedOn这一句了